Quantum mechanics

Catalysis

Acid gas

Adsorption

Engineering

Metallurgy

Materials science

Inorganic chemistry

Sulfate

Chemical engineering

Physics

Organic chemistry

Amine gas treating

Bimetallic strip

Combustion

Metal-organic framework

Composite material

Chemistry

Volume (thermodynamics)

Specific surface area

Microporous and Mesoporous Materials

A series of polyethyleneimine (PEI)-impregnated MIL-101(Cr, Mg) adsorbents with different PEI loadings was synthesized in the present work. Although the surface area and pore volume of MIL-101(Cr, Mg) decreased significantly as the PEI loading increased, all the resulting composites exhibited a dramatically enhanced CO2 adsorption capacity at low pressures. Up to 20 wt% PEI loading, the CO2 adsorption capacity reached a competitive value of about 3 mmol/g at 25 °C and 1 bar. The stability of these PEI-MIL-101(Cr, Mg) composites was analyzed by exposing them to humid air, SOx, and NOx for a period of six days. No noticeable changes could be discerned in the X-ray diffraction patterns of the exposed composites; however, the CO2 adsorption capacity reduced by 30%–35% due to the formation of nitrate and sulfate compounds on the surfaces of the materials.

CO2 capture using amine-functionalized bimetallic MIL-101 MOFs and their stability on exposure to humid air and acid gases